<html>
<head>
<style>
iframe {
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  height:400px;
  border:0;
}
</style>
</head>
<body style="width:2000px; background:white;"><div style="position:absolute; top:360px;width:100px;height:40px; background:black;"></div>
<iframe src="data:application/vnd.mozilla.xul+xml,%3Cwizard%20xmlns%3D%22http%3A%2F%2Fwww.mozilla.org%2Fkeymaster%2Fgatekeeper%2Fthere.is.only.xul%22%3E%3C%2Fwizard%3E%0D%0A%0D%0A"></iframe>
</body>
</html>
